Linux利用keepalived实现lvs的高可用性的操作方法

吾爱主题阅读：124 2024-04-05 13:54:51 评论：0

lvs+keepalived是什么？

keepalived工作原理

keepalived是集群管理中保证集群高可用的一个服务软件，其功能类似于heartbeat，用来防止单点故障。 keepalived是以vrrp协议为实现基础的，vrrp全称virtual router redundancy protocol，即虚拟路由冗余协议。虚拟路由冗余协议，可以认为是实现路由器高可用的协议，即将n台提供相同功能的路由器组成一个路由器组，这个组里面有一个master和多个backup，master上面有一个对外提供服务的vip（该路由器所在局域网内其他机器的默认路由为该vip），master会发组播，当backup收不到vrrp包时就认为master宕掉了，这时就需要根据vrrp的优先级来选举一个backup当master。这样的话就可以保证路由器的高可用了。

lvs简介

lvs是linux virtual server的简写，意即linux虚拟服务器，是一个虚拟的服务器集群系统。本项目在1998年5月由章文嵩博士成立，是中国国内最早出现的自由软件项目之一。目前有三种ip负载均衡技术（vs/nat、vs/tun和vs/dr），十种调度算法。

本文重点给大家介绍linux利用keepalived实现lvs的高可用性的操作方法，感兴趣的朋友参考下吧。

单主模型ipvs示例

配置keepalive

高可用的ipvs集群示例：修改keepalived配置文件

修改主机：192.168.234.27的keepalived配置文件

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 [root@234c27 ~] # vim /etc/keepalived/keepalived.conf ! configuration file for keepalived global_defs { notification_email { root@localhost // 接受邮件地址 } notification_email_from keepalived@localhost // 发送邮件地址 smtp_server 127.0.0.1 // 发送邮件服务器ip smtp_connect_timeout 30 // 邮件连接超时时长 router_id kptwo // 路由 id vrrp _mcast_group4 234.10.10.10 // 指定vrrp协议的多播地址 } vrrp_instance vi_1 { //vrrp 协议的 state master //lvs 的master服务器 interface ens37 // virtual_router_id 50 // 虚拟路由 priority 100 // 权重为100.越大越先 advert_int 1 // 发送组博包的间隔 authentication { // 验证 auth_type pass // 方式为pass( 明文) auth_pass 1111 // 密码 } virtual_ipaddress { //keepalived 虚拟ip 10.0.0.100 /24 } } virtual_server 10.0.0.100 80 { delay_loop 6 // 检查后端服务器的时间间隔 lb_algo wrr // 定义调度方法 lb_kind dr // 集群的类型 #persistence_timeout 50 //持久连接时长 protocol tcp // 服务协议，仅支持tcp real_server 192.168.234.47 80 { // 后端real_server服务器地址 weight 1 // 权重 http_get { // 应用层检测 url { path / // 定义要监控的url status_code 200 // 判断上述检测机制为健康状态的响应码 } connect_timeout 3 // 连接请求的超时时长 nb_get_retry 3 // 重试次数 delay_before_retry 3 // 重试之前的延迟时长 } } real_server 192.168.234.57 80 { weight 2 http_get { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } }

修改主机：192.168.234.37的keepalived配置文件

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 [root@234c37 ~] # vim /etc/keepalived/keepalived.conf ! configuration file for keepalived global_defs { notification_email { root@localhost } notification_email_from keepalived@localhost smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id kptwo vrrp _mcast_group4 234.10.10.10 } vrrp_instance vi_1 { state backup interface ens37 virtual_router_id 50 priority 80 advert_int 1 authentication { auth_type pass auth_pass 1111 } virtual_ipaddress { 10.0.0.100 /24 } } virtual_server 10.0.0.100 80 { delay_loop 6 lb_algo wrr lb_kind dr #persistence_timeout 50 protocol tcp sorry_server 127.0.0.1:80 real_server 192.168.234.47 80 { weight 1 http_get { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } real_server 192.168.234.57 80 { weight 2 http_get { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } }

查看keepalived

1 2 3 4 5 6 7 8 9 10 [root@234c37 ~] # systemctl status keepalived ● keepalived.service - lvs and vrrp high availability monitor loaded: loaded ( /usr/lib/systemd/system/keepalived .service; disabled; vendor preset: disabled) active: inactive (dead) ………… [root@234c37 ~] # ipvsadm -ln ip virtual server version 1.2.1 (size=4096) prot localaddress:port scheduler flags -> remoteaddress:port forward weight activeconn inactconn // 暂无ipvsadm

启动服务

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 [root@234c27 keepalived] # systemctl start keepalived.service [root@234c27 keepalived] # systemctl status keepalived.service ● keepalived.service - lvs and vrrp high availability monitor loaded: loaded ( /usr/lib/systemd/system/keepalived .service; disabled; vendor preset: disabled) active: active (running) since fri 2018-08-31 20:30:02 cst; 12s ago process: 9657 execstart= /usr/sbin/keepalived $keepalived_options (code=exited, status=0 /success ) main pid: 9658 (keepalived) ……………… [root@234c27 keepalived] # ipvsadm -ln ip virtual server version 1.2.1 (size=4096) prot localaddress:port scheduler flags -> remoteaddress:port forward weight activeconn inactconn tcp 10.0.0.100:80 wrr -> 192.168.234.47:80 route 1 0 0 -> 192.168.234.57:80 route 2 0 0 // 启动服务lvs vs已配置好

后端real_server准备

增加ip在网卡上修改限制arp通告及应答级别 rs1 rs2都做，网关并指向路由

1 2 3 4 5 6 ip a a 10.0.0.100 /32 dev ens37 echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce route add default gw 192.168.234.17

安装httpd服务写好网页文件

启动服务

image

多主模型ipvs示例

配置keepalive

高可用的ipvs集群示例：修改keepalived配置文件

修改主机：192.168.234.27的keepalived配置文件

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 [root@234c27 keepalived] # vim /etc/keepalived/keepalived.conf global_defs { notification_email { root@localhost } notification_email_from keepalived@localhost smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id kpone vrrp _mcast_group4 234.10.10.10 } vrrp_instance vi_1 { state master interface ens37 virtual_router_id 50 priority 100 advert_int 1 authentication { auth_type pass auth_pass 1111 } virtual_ipaddress { 10.0.0.100 /24 } } vrrp_instance vi_2 { state backup interface ens37 virtual_router_id 51 priority 80 advert_int 1 authentication { auth_type pass auth_pass 2222 } virtual_ipaddress { 10.0.0.200 /24 } } virtual_server 10.0.0.100 80 { delay_loop 6 lb_algo wrr lb_kind dr #persistence_timeout 50 protocol tcp #sorry_server 127.0.0.1:80 real_server 192.168.234.47 80 { weight 1 http_get { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } } virtual_server 10.0.0.200 80 { delay_loop 6 lb_algo wrr lb_kind dr #persistence_timeout 50 protocol tcp #sorry_server 127.0.0.1:80 real_server 192.168.234.57 80 { weight 1 http_get { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } }

修改主机：192.168.234.37的keepalived配置文件

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 [root@234c37 ~] # vim /etc/keepalived/keepalived.conf ! configuration file for keepalived global_defs { notification_email { root@localhost } notification_email_from keepalived@localhost smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id kptwo vrrp _mcast_group4 234.10.10.10 } vrrp_instance vi_1 { state backup interface ens37 virtual_router_id 50 priority 80 advert_int 1 authentication { auth_type pass auth_pass 1111 } virtual_ipaddress { 10.0.0.100 /24 } } vrrp_instance vi_2 { state master interface ens37 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type pass auth_pass 2222 } virtual_ipaddress { 10.0.0.200 /24 } } virtual_server 10.0.0.100 80 { delay_loop 6 lb_algo wrr lb_kind dr #persistence_timeout 50 protocol tcp #sorry_server 127.0.0.1:80 real_server 192.168.234.47 80 { weight 1 http_get { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } } virtual_server 10.0.0.200 80 { delay_loop 6 lb_algo wrr lb_kind dr #persistence_timeout 50 protocol tcp #sorry_server 127.0.0.1:80 real_server 192.168.234.57 80 { weight 1 http_get { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } }

让10.0.0.100的ip优先分配至192.168.234.47 192.168.234.57备用

让10.0.0.200的ip优先分配至192.168.234.57 192.168.234.47备用

后端real_server准备

修改192.168.234.57的vip为10.0.0.200/32

1 2 3 4 5 6 7 8 [root@234c27 keepalived] # ipvsadm -ln ip virtual server version 1.2.1 (size=4096) prot localaddress:port scheduler flags -> remoteaddress:port forward weight activeconn inactconn tcp 10.0.0.100:80 wrr -> 192.168.234.47:80 route 1 0 0 tcp 10.0.0.200:80 wrr -> 192.168.234.57:80 route 1 0 0

现在宕掉一个lvs

1 2 3 4 5 [root@234c27 keepalived] # systemctl stop keepalived.service [root@234c27 keepalived] # ipvsadm -ln ip virtual server version 1.2.1 (size=4096) prot localaddress:port scheduler flags -> remoteaddress:port forward weight activeconn inactconn

依然提供服务

1 2 3 4 5 6 7 8 [root@234c37 ~] # ipvsadm -ln ip virtual server version 1.2.1 (size=4096) prot localaddress:port scheduler flags -> remoteaddress:port forward weight activeconn inactconn tcp 10.0.0.100:80 wrr -> 192.168.234.47:80 route 1 0 21 tcp 10.0.0.200:80 wrr -> 192.168.234.57:80 route 1 0 39

后一个实现基于前一个的基础上修改来的

假设要实现sorry_server

1.把rs服务都停掉。然后在lvs上安装apache或者nginx服务

2.将keepalived配置文件中的

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 virtual_server 10.0.0.200 80 { delay_loop 6 lb_algo wrr lb_kind dr #persistence_timeout 50 protocol tcp #sorry_server 127.0.0.1:80 //这一行来修改写出服务出错之后的页面 real_server 192.168.234.57 80 { weight 1 http_get { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } } }

原文链接：https://www.cnblogs.com/OrochWang/archive/2018/08/31/9568225.html

可以去百度分享获取分享代码输入这里。

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